File:Paal-Knorr-thiophen-synth mechanism.svg - Wikipedia
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A trisulfur radical anion (S 3 ˙ − ) involved sulfur insertion reaction of 1,3-enynes: sulfide sources control chemoselective synthesis of 2,3,5-trisu ... - Chemical Communications (RSC Publishing) DOI:10.1039/C9CC03604K